U.S. patent number 4,162,867 [Application Number 05/896,681] was granted by the patent office on 1979-07-31 for dual cutter boring head.
This patent grant is currently assigned to Carando Machine Works. Invention is credited to Donald W. Barton, Donald J. Calcaterra, Robert A. Rhinefrank.
United States Patent |
4,162,867 |
Calcaterra , et al. |
July 31, 1979 |
Dual cutter boring head
Abstract
In the machine tool art, a dual cutter boring head which
comprises a cylindrical body having side-by-side, tool-holding
slides mounted diametrally thereon; the slides at their outer ends
being fitted with cutters disposed exteriorly of the periphery of
the body, and micro-adjustment mechanism within the confines of the
body arranged to impart simultaneous, opposed, reversible motion to
the slides whereby to precisely and equally adjust the slides and
the cutters thereon outwardly or inwardly, selectively.
Inventors: |
Calcaterra; Donald J.
(Stockton, CA), Rhinefrank; Robert A. (Stockton, CA),
Barton; Donald W. (Manteca, CA) |
Assignee: |
Carando Machine Works
(Stockton, CA)
|
Family
ID: |
25406621 |
Appl.
No.: |
05/896,681 |
Filed: |
April 17, 1978 |
Current U.S.
Class: |
408/157; 408/161;
408/173; 408/178; 408/179 |
Current CPC
Class: |
B23B
29/03403 (20130101); Y10T 408/859 (20150115); Y10T
408/8592 (20150115); Y10T 408/85892 (20150115); Y10T
408/8593 (20150115); Y10T 408/8585 (20150115) |
Current International
Class: |
B23B
29/00 (20060101); B23B 29/034 (20060101); B23B
051/00 () |
Field of
Search: |
;408/173,174,178,179,157,181,183,185,161,168,197 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
|
|
|
|
1075921 |
|
Feb 1960 |
|
DE |
|
2012643 |
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Oct 1971 |
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DE |
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1149410 |
|
Dec 1957 |
|
FR |
|
354646 |
|
Jul 1961 |
|
CH |
|
Primary Examiner: Briggs; William R.
Attorney, Agent or Firm: Webster; Roger B.
Claims
We claim:
1. A dual cutter boring head comprising a body adapted for rotation
about a predetermined axis, the body having a diametral channel
therein, a pair of tool-holding slides disposed in side-by-side
relation in the channel, the channel having a bottom, means
retaining the slides in the channel in engagement with the bottom
thereof, each slide having an outer end projecting from a
corresponding side of the body, a cutter mounted on each slide at
said outer end, a member journaled in the body for rotation about
the axis thereof, such member having a face open to the bottom of
the channel, a pair of pins on said member in spaced-apart,
radially-opposed relation, the pins projecting from the face of
said member into the channel, the slides having transverse slots
therein, the pins engaging in corresponding slots whereby--upon
part-circle rotation of such member--the pins move the slides in
opposition in the channel to adjust the cutters, means on the body
operable from exteriorly thereof arranged to cause such part-circle
rotation of said member, and releasable means normally securing the
slides against movement in the channel.
2. A boring head, as in claim 1, in which the channel is initially
open opposite the bottom; there being a cover plate secured on the
body in closing relation to the channel and overlying the slides
therein.
3. A boring head, as in claim 1, including clamping strips engaged
between the sides of the channel and the adjacent slides; there
being means in the body normally, but releasably, urging the strips
into clamping engagement with the related slides.
4. A boring head, as in claim 1, in which the means to cause
part-circle rotation of said member includes a screw, and a
motion-translating connection between the screw and said member;
the screw being reversibly rotatable whereby, through such
connection, to cause rotation of said member in one direction or
the other, selectively, with attendant simultaneous movement of the
slides in opposition and in directions to adjust the cutters
outwardly or inwardly, respectively.
5. A boring head, as in claim 1, in which said member is a circular
rotary carrier, and the means to cause part-circle rotation of such
carrier includes --within the body--a spindle fixed on and
projecting radially from the carrier, a ball on the outer end of
the spindle, a socket in which the ball is engaged, the socket
being formed laterally on a nut, an axially fixed screw reversibly
rotatable in the body and operable from exteriorly thereof, the nut
being threaded on the screw and movable along such screw upon
reversible rotation thereof, movement of the nut on the screw being
translated by the socket-engaged ball and the spindle into said
part-circle rotation of the carrier in one direction or the other,
selectively, with attendant simultaneous movement of the slides in
opposition and in directions to adjust the cutters outwardly or
inwardly, respectively.
6. A dual cutter boring head comprising a body adapted for rotation
about a predetermined axis, the body having a diametral channel
therein, a pair of tool-holding slides disposed in side-by-side
relation in the channel, each slide having an outer end projecting
from a corresponding side of the body, a cutter mounted on each
slide at said outer end, a rotatable member journaled in the body,
means in the body between said member and the slides
operative--upon part-circle rotation of such member--to move the
slides in opposition in the channel to adjust the cutters, means in
the body in part accessible from exteriorly thereof arranged to
cause such part-circle rotation of said member, and releasable
means normally securing the slides against movement in the channel;
the means to cause part-circle rotation of said member including a
screw, and a motion-translating connection between the screw and
said member; and said motion-translating connection comprising a
nut threaded on and lineally movable along the screw upon rotation
thereof, the nut having a laterally opening socket formed thereon,
the screw being parallel to the axis of the member, a radial
spindle on and projecting from the member, and a ball on the outer
end of the spindle engaged in the socket.
7. A dual cutter boring head comprising a body adapted for rotation
about a predetermined axis, the body having a diametral channel
therein, a pair of tool-holding slides disposed in side-by-side
relation in the channel, each slide having an outer end projecting
from a corresponding side of the body, a cutter mounted on each
slide at said outer end, a rotatable member journaled in the body,
means in the body between said member and the slides
operative--upon part-circle rotation of such member--to move the
slides in opposition in the channel to adjust the cutters, means in
the body in part accessible from exteriorly thereof arranged to
cause such part-circle rotation of said member, and releasable
means normally securing the slides against movement in the channel;
the means to cause part-circle rotation of said member comprising a
screw extending in adjacent but spaced relation to the member and
parallel to its axis, a nut threaded on and lineally movable along
the screw upon rotation thereof, the screw having an operating end
accessible from exteriorly of the body, a socket formed on the nut
and opening toward said member, a radial spindle fixed on said
member and projecting toward the socket, and a ball on the outer
end of the spindle engaged in the socket.
8. A dual cutter boring head comprising a body adapted for rotation
about a predetermined axis, the body having a diametral channel
therein, a pair of tool-holding slides disposed in side-by-side
relation in the channel, each slide having an outer end projecting
from a corresponding side of the body, a cutter mounted on each
slide at said outer end, a rotatable member journaled in the body,
means in the body between said member and the slides
operative--upon part-circle rotation of such member--to move the
slides in opposition in the channel to adjust the cutters, means in
the body in part accessible from exteriorly thereof arranged to
cause such part-circle rotation of said member, and releasable
means normally securing the slides against movement in the channel;
the channel having a bottom, and a face of said member being open
to said bottom of the channel, the member being journaled for
rotation about the axis of the body, and said slide moving means
comprising a pair of pins on said member in spaced-apart,
radially-opposed relation, the pins projecting from the face of
said member into the channel, the slides having transverse slots
therein, and the pins engaging in corresponding slots.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
Dual cutter boring heads are known in the machine tool art, and
wherein the cutters--disposed in diametrally opposed relation--are
mounted on slides carried on a rotary body. However, the mechanisms
provided to effect adjustment of the slides and cutters thereon has
frequently been unsatisfactory in that extremely precise settings
of the cutters could not be attained and as modern machining
practices demand. Also, the manner of mounting the tool-holding
slides did not always maintain them against undesirable loose play.
The present invention was conceived in a successful effort to avoid
such problems.
2. The Prior Art
U.S. Pat. Nos. 402,394; 767,036; 1,392,203; 1,813,668; 1,883,810;
2,223,041; 3,456,531; 3,702,611 and 3,902,386 represent the most
relevant prior art known to applicants.
The above prior art--considered singly or together--does not
anticipate, nor suggest as obvious, the particular structure and
function of the herein-claimed dual cutter boring head, and
applicants have no knowledge of any prior art disclosing such
particular structure and its function.
SUMMARY OF THE INVENTION
The present invention provides, as a major object, a dual cutter
boring head which comprises a cylindrical body having side-by-side,
tool-holding slides mounted diametrically thereon; the slides at
their outer ends being fitted with cutters disposed exteriorly of
the periphery of the body, and micro-adjustment mechanism within
the confines of the body arranged to impart simultaneous, opposed,
reversible motion to the slides whereby to precisely and equally
adjust the slides and the cutters thereon outwardly or inwardly,
selectively.
The present invention provides, as a further object, a dual cutter
boring head which is designed for ease and economy of
manufacture.
The present invention provides, as a still further object, a
practical, reliable, and durable dual cutter boring head, and one
which is exceedingly effective for the purpose for which it is
designed.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevation--partly broken away and in section--of
the dual cutter boring head; the view being of the side from which
the head of the adjusting screw is accessible.
FIG. 2 is a face elevation of the dual cutter boring head.
FIG. 3 is a sectional view taken substantially on line 3--3 of FIG.
2.
FIG. 4 is a sectional view taken substantially on line 4--4 of FIG.
1; the view showing one of the slide actuating pins, and the latter
in a position rotated approximately 30 degrees counterclockwise
from FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now more particularly to the drawings and to the
characters of reference marked thereon, the dual cutter boring
head, indicated generally at 1, is comprised of a cylindrical body
2 provided on the face with a removable, circular cover plate 3
held in place by bolts 4 having countersunk heads 5. The boring
head 1 is mounted on the outer end of a boring bar 6 by bolts 7
having countersunk heads 8; the head 1 being centered on the boring
bar 6 by a pilot neck 9 received in a recess 10.
Beneath the cover plate 3, and outwardly closed thereby, the body 2
is formed with a diametral channel 11 which is rectangular in cross
section; the channel receiving therein a pair of side-by-side,
tool-holding slides 12 also rectangular in cross section and
substantially fitting in channel 11 between clamping strips 13
which line the sides of said channel, and fitting between the cover
plate 3 and the bottom of such channel.
The strips 13 are fixed adjacent one end to the related side of
channel 11 by screws 14, while--adjacent the other end--the strips
13 are engaged by plug-type screws 15 which--when tightened--urge
the strips into clamping engagement with the corresponding slide
12.
The cover plate 3 is fitted with spring-pressed balls 16 carried in
screw plugs 17 and exposed to the inner face of said cover plate;
the balls 16 bearing on the slides 12 and urging them into close
engagement with the bottom of channel 11.
Each of the slides 12 is provided at the outer end thereof, and
exteriorly of the periphery of body 2, with a cutter 18; such
cutters being removable for replacement, and of standard form.
In a selected position of adjustment of the cutters (with the
adjustment accomplished as hereinafter appears, and before use of
the boring head), the tool or cutter holding slides 12 are clamped
against motion by tightening the screws 15 against the strips 13,
and which binds the latter against the related slides. For proper
and balanced clamping, each screw 15 opposes a screw 14.
The following micro-adjusting mechanism is employed to impart
simultaneous, opposed, reversible motion to the slides whereby to
precisely and equally adjust the slides and the cutters thereon
outwardly or inwardly, selectively.
The body 2 is formed with a circular, axial bore 19 which opens
into the channel 11 at the bottom, and centrally of the ends,
thereof. A circular, flat-faced, rotary carrier 20 is disposed in
the bore 19 with a close running fit; the face of the carrier 20
being flush with the bottom of channel 11.
A pair of spaced, diametrally opposed pins 21 are fixed on the
carrier 20 and project from the face thereof into said channel 11
in parallelism to the axis of body 2. The carrier 20 includes an
integral, reduced-diameter pilot shank 22 which turnably projects
into an extension 19a of bore 19.
The slides 12--intermediate their ends--are each transversely
straight-slotted on the underside, with such cross slots--indicated
at 23--individually receiving a corresponding one of the pins 21
with a close but sliding fit. Upon part-circle rotation of the
carrier 20, and as the pins 21 are equally spaced on opposite sides
of the axis of said carrier 20, the slides 12 (and the cutters 18
thereon) are simultaneously moved outwardly or inwardly (depending
on the direction of carrier rotation) to adjust said cutters to a
desired working position and with each exactly the same distance
from the axis of the boring head.
The pin carrier 20 is reversibly part-circle rotated, for the above
purpose, by the following micro-adjustment arrangement accommodated
by suitable aperturing within the body 2.
A spindle 24 extends diametrally in the carrier 20 and is secured
therein by a set screw 25; such spindle 24--at one end and
exteriorly of said carrier 20--being formed with an integral ball
26.
The ball 26 seats in a socket 27 formed in laterally offset
relation on a cylindrical nut 28 threaded on an adjustment screw
29; the cylindrical nut 28 being slidably guided in a bore 30
extending tangentially of the bore 19.
At its outer end, the screw 29 includes a neck 31, having a stop
collar 31a, associated with a retainer 32 secured in a recess 33 in
body 2 by bolts 34; the outer and exposed end of said screw 29
being formed with a multi-sided head 35 (adapted for wrench
reception) and an indexing dial 36 on which a pointer 37 reads.
For use, the above-described boring head is first adjusted to the
desired cutting diameter; this being accomplished as follows:
At the outset, the clamping screws 15 are both untightened and
which frees the slides 12 for sliding motion in the channel 11
between the clamping strips 13. Nextly, by a hand wrench engaged on
the head 35, the screw 29 is rotated (in one direction or the
other) causing the nut 28 to advance or retract on said screw 29.
Such lineal travel of the nut 28 is translated--by the ball
26--into part-circle rotary motion of carrier 20. Upon the
occurrence of such part-circle rotary motion of the carrier 20, the
pins 21 simultaneously--but oppositely--shift the slides 12 in the
channel 11 and to a selected position of the cutters 21. After the
slides 12 are so adjusted, the clamping screws 15 are tightened,
forcing the clamping strips 13 against the slides and binding them
against slippage in channel 11. The boring head 1 is then used in a
conventional manner.
The advantages of the described dual cutter boring head include its
simplicity of structure and ready manufacture and assembly, while
providing--through the medium of its microadjusting mechanism--very
precise and accurate setting of the cutters through the entire
range of adjustment. The boring head is rugged, easy to adjust,
functions without vibration, and is subject to a minimum of wear
and tear in use.
From the foregoing description, it will be readily seen that there
has been produced such a dual cutter boring head as substantially
fulfills the objects of the invention as set forth herein.
While this specification sets forth in detail the present and
preferred construction of the dual cutter boring head, still in
practice such deviations from such detail may be resorted to as do
not form a departure from the spirit of the invention as defined by
the appended claims.
* * * * *